instrument cluster IVR

Topic: instrument cluster IVR (Read 7398 times) previous topic - next topic

instrument cluster IVR

Reply #15 – May 20, 2014, 07:51:50 PM

Jay you can not eliminate the CVR. Cluster Voltage Regulator. reason being the impedance is variable as the gauges change readings. An electronic unit as posted is the best bet. Other than individual feeds with the resistor and constant 5 volts. The resistor limits voltage and current. I think the resistor is in the circuit in case the CVR goes bad and remains contact closed. It will save the gauges from burning up. I thought about it last night after posting i did not understand it's use. I am certain it is used as protection for the gauges by design if the CVR shorts out and supplies 12 Volts to the gauges. remember resistors limit current and voltage as well with it's load, OHMS LAW applies here. So last night at 3 AM i woke up in a cold sweat and i am certain the low OHM resistor is a protector for the coils in the gauges if the CVR shorts out and supplies full 12 Volts to the gauges. I dont believe a charging issue will effect the gauges enough to make a difference. But i will tell you that at 12 Volts engine not running and at 14 Volts engine running there is a slight difference. I tested it last night on my Ramcharger and it does move the needles all of them a bit higher when under charge voltage. My Ramcharger is 100% stock and you can actually see the gauge needles pulse a tiny bit weather under charge or not. It follows the pulsing of the CVR. I use the electronic chip and capacitors as posted above several times with good results as well. Have a good night guys.

instrument cluster IVR

Reply #16 – May 21, 2014, 12:43:22 AM

i wasnt considering eliminating it.
your agreeing, the resistance wire coupled with the internal resistivity of the CVR/IVR, coupled with the far end termination resistance all offer voltage drops.

that was my earlier point.

instrument cluster IVR

Reply #17 – May 22, 2014, 05:32:51 PM

Quote from: jcassity;433982

are those two 10uF caps there?

There is a 1u/100V at the input and 10u/35V at the output, if my memory serves. Data sheet says at least 330n at the input, I've just used what lied around. 10u and 10u should work fine as well.

BTW, it's necessarry to use 78[COLOR="#FF0000"]T[/COLOR]05, which is designed for 3A current draw. Standard 7805 is designed for just 1A, which isn't enough when all needles show high values.

instrument cluster IVR

Reply #18 – May 24, 2014, 10:15:01 AM

in your layout, i assume the caps serve as over current protection to the regulator and instrument cluster gauges?

instrument cluster IVR

Reply #19 – May 25, 2014, 12:03:08 PM

Nope, they are just smoothing the volatge. The output one should be at least 100n, if I am right, but they are necessary.

It's DC circuit, so capacitors can't work as a current limiter. They can work that way only in AC circuits.

instrument cluster IVR

Reply #20 – May 26, 2014, 07:43:26 PM

as time allows and as i mentioned earlier in this IVR dedicated post, my son finally was able to do a test.
he removed the neg battery cable while the car was running and the car died. He did take it to a parts store which they did a charge system test but the fella there just did the test and handed him a slip with the information. I find it odd they didnt try to sell him something. the slip says things that point to a failing charge system.

I told my son to get another 3g, when we did his engine build , all we did was put on a new regulator. I suspect the alternator itself may be partially bad,, the battey does not last him very long either if he leaves a door open or the radio on just to do something simple like an oil change.

He is convinced that taking off the battey cable will make the car die,, ill get through to him but in the meantime... we are not mod'ing anything until this charge issue is solved by a battery, alternator or both. I told him i would prefer he do both at the same time.

his original call to me today was to tell me that putting the 4) 100ohm resistors in parallel at the sender worked great and the needle went to just a hair above half way. I told him to yank it out though so we can get it confirmed that new charge parts will lower the needle.
im suspecting the alternator is ramping up the voltage a tad too high. I wish i had remember to ask him to put his meter to AC and see if there was any ripple.

oh well.. stay tuned.

instrument cluster IVR

Reply #21 – May 26, 2014, 08:24:12 PM

Check your engine ground to chassi and also the fender ground by the battery. if either of these are bad they will do the same thing.

instrument cluster IVR

Reply #22 – May 26, 2014, 08:31:10 PM

JAY with all due respect disconnecting a cable from a running engine is not only extreamly dangerous. But is not an approved test by any means. I do not know where this nonsense started but i would advise you to tell your son not to do it again. Not only can the battery explode you can fry every electronic component in the car. it is something i would suggest not doing. We have had only 3 battery explosions in my career and one is to many. They can inflict serious injuries. Removing the battery from the charging system while running puts AC spikes in every component. The AC voltage spikes over 130Volts without a battery load. The battery smooths out all the AC ripples in the charging system. Many a car has be ruined doing this. Especially newer cars loaded with electronics. Never ever do that. Have a good evening folks

instrument cluster IVR

Reply #23 – May 26, 2014, 09:22:49 PM

Tom, I remember the FIRST time I witnessed a battery exploding. I was surprised at how violent it was. Poor fella who's bay it happened in.......ouch.

instrument cluster IVR

Reply #24 – May 27, 2014, 05:37:13 AM

Matt we all take battery's for granted and do stupid things around them myself included. But as you point out when they go it is horrific. Acid spray in your face ETC. We have a charging station that is OSHA approved for charging batterys and they check it. In the vehicle one must be extreamly careful around battery's and how we charge them and jump them. have a great day guys> Be careful around battery's!

instrument cluster IVR

Reply #25 – May 28, 2014, 01:38:45 AM

in a last cast / worse case situation where you've looked at everything,, and managing the risk, i see no issue in confirming a fault this way.

many miles separate us from each other and so to that end, what would you say is the issue if the car fails to continue running after the battery is removed from the circuit? I have mentioned this before but your saying you dont know where this nonsense came from. *it came from my comments early on that you didnt tie in. my guess is you dont have reasonable understanding of this threads objective.

here is your situation supporting the end user....
-he's in a parking lot at his appartment
-he has just got off work
-he has 2 hrs to get to his next job

im a subject matter expert on batteries,, ill stop there.

instrument cluster IVR

Reply #26 – May 28, 2014, 01:52:11 AM

yeah did
oddly enough the 3.8L ground is different from the samy year 5.0 variety.

the 3.8 L does the battery ground in a logical manner to me.
the 3.8 neg cable transitions down to the frame, which a partial section of the insulation is removed and a crimped on side tap lug is there to bolt the copper to frame ground. The wire coninues on and over to the engine block.

on the 5.0, the neg batt cable is a home run to the engine block.

yes we check the smaller parallel gnds as well.

instrument cluster IVR

Reply #27 – May 28, 2014, 05:42:15 AM

instrument cluster IVR

Reply #28 – May 28, 2014, 05:48:28 AM

instrument cluster IVR

Reply #29 – June 02, 2014, 03:24:55 AM

http://www.headsuphobby.com/3-Amp-Universal-Battery-Elimination-Circuit-UBEC-G-150.htm

i was thinking about this while playing with my model airplanes tonight.

Up to 30v's input and a continuous 5.00v output. i mesured mine with a multi meter and a load of about 5 amps and it never got above or below more than .01v's. might be a bit more expensive, but its cheap and easy to wire in.